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Why does my RT-AX88u show ports 80,443 & 21 open from WAN?

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I am sure this kind of question gets asked a lot but I have been reading many different forums/threads/sites and I just cant figure out why Nmap is showing ports 80, 443 & 21 open on my router. I have UPnP & Port Trigger disabled & I only have 1 port forwarded which is for my Plex server. So why does Nmap show HTTP, HTTPS & FTP as open?
Appreciate if anyone can explain?

Note that I did run the test outside of my network from a completely different public IP so its not just picking up LAN ports.


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